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TPS63020始终输出1.23V

Other Parts Discussed in Thread: TPS63020

大家好,小弟请教一个问题,在使用TPS63020想要输出3.6V电压时设计的电路如下图:

其中R8没有焊接,底部PGND焊盘良好焊接。

VIN供电是5.02V,可是Vout得到的输出电压一直是1.23V,无论怎么更换R11的电阻值,输出电压一直是1.23V

请问,这是什么原因导致的?应该怎么解决这个问题,多谢大家了。